Posted March 27, 2016
Some older games have the copy protection mechanism integrated directly into the game code--the only remedy for that is to hex edit, as has been mentioned. It always pays to recall that GOG is not the developer of these games--just a distributor for them. While GOG can usually remove DRM which has been added to a game and is not an intrinsic part of the code for the game, changing the bits might constitute copyright violations should the IP owner decide not to hack the game to remove it, or to allow GOG to do so. OTOH, there is nothing stopping an owner of a copy of the game from doing whatever he likes to his copy of the game, such as hex editing, for instance.